US11860403B2 - Backlight module including optical film with peripheral portion lug structure and display device including the same - Google Patents
Backlight module including optical film with peripheral portion lug structure and display device including the same Download PDFInfo
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- US11860403B2 US11860403B2 US17/425,711 US202117425711A US11860403B2 US 11860403 B2 US11860403 B2 US 11860403B2 US 202117425711 A US202117425711 A US 202117425711A US 11860403 B2 US11860403 B2 US 11860403B2
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- optical film
- light
- backlight module
- middle frame
- lug structure
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- 239000012788 optical film Substances 0.000 title claims abstract description 120
- 230000002093 peripheral effect Effects 0.000 title claims abstract description 16
- 238000005452 bending Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133325—Assembling processes
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
Definitions
- the present disclosure relates to the field of display technology, in particular to a backlight module and a display device.
- the optical film is provided with a certain amount of lug structures, chutes are formed in a side wall of a middle frame, and the lug structures of the optical film are inserted into the chutes respectively so as to be hung on the side wall of the middle frame.
- a gap is provided between the lug structure of the optical film and the middle frame at the chute, so light exits the middle frame directly through the gap.
- the lug structure of the optical film and the chute in the side wall of the middle frame are each arranged very proximate to a display region of a module screen, and a shadow of the lug structure is capable of being viewed in an image at a certain viewing angle. Hence, a visual effect and the user experience, and thereby display quality of the product, are adversely affected.
- An object of the present disclosure is to provide a backlight module and a display device.
- a backlight module including:
- an extension direction of the groove is a first direction, and the first direction intersects an extension direction of the fourth portion, and is parallel to a light-exiting surface of the optical film.
- the first portion further includes a support surface for supporting a display panel, the support surface is arranged parallel to the light-exiting surface of the optical film, and arranged between the inner surface and the outer surface, and the groove is a concave structure formed in the support surface.
- a groove depth of the groove in a second direction perpendicular to the light-exiting surface of the optical film is greater than a thickness of the optical film by 0.2 mm to 0.5 mm.
- the groove includes a wall configured to be in contact with the lug structure to support the lug structure, the wall is arranged parallel to the light-entering surface of the optical film, a first height difference is provided between the wall and the light-entering surface of the optical film in a second direction, and the second direction is perpendicular to the light-exiting surface.
- the first height difference is within a range of 0.1 mm to 0.2 mm.
- a second height difference is provided between the support surface and the light-exiting surface of the optical film in a second direction, and the second direction is perpendicular to the light-exiting surface.
- the second height difference is within a range of 0.2 mm to 0.5 mm.
- the body portion includes a first region corresponding to a display region of the display panel, and an orthogonal projection of the inner surface of the first portion onto the light-entering surface of the optical film is located out of the first region.
- a minimum distance between the orthogonal projection of the inner surface of the first portion onto the light-entering surface of the optical film and the first region in the first direction is within a range of 0.1 mm to 0.2 mm.
- the backlight module further includes a front frame, wherein the front frame is arranged at periphery of the middle frame, and includes an inner side wall proximate to the middle frame and an outer side wall distal to the middle frame, a recess is formed in the inner side wall at a position corresponding to the lug structure, and the fourth portion is accommodated in the recess.
- the recess penetrates through the inner side wall and the outer side wall of the front frame.
- a bending point is formed at a joint between the third portion and the fourth portion, and the bending point is located beyond the outer surface of the middle frame and spaced apart from the outer surface of the middle frame by a first distance in the first direction.
- the first distance is within a range of 0.1 mm to 0.2 mm.
- the lug structure further includes a hole that is formed in the fourth portion and penetrates through the optical film, and the fourth portion is sleeved on the protrusion structure through the hole.
- a display device including:
- a display panel arranged at the light-exiting surface of the optical film.
- FIG. 1 is a schematic view of a display module in related art
- FIG. 2 is a sectional view of a backlight module according to an embodiment of the present disclosure
- FIG. 3 is a solid view of the backlight module according to an embodiment of the present disclosure.
- FIG. 4 is a solid view of the backlight module without a front frame according to an embodiment of the present disclosure
- FIG. 5 is a topically enlarged view of a portion A′ in FIG. 4 ;
- FIG. 6 is a solid view of a display device according to an embodiment of the present disclosure.
- any technical or scientific term used herein shall have the common meaning understood by a person of ordinary skills.
- Such words as “first” and “second” used in the specification and claims are merely used to differentiate different components rather than to represent any order, number or importance.
- such words as “one” or “one of” are merely used to represent the existence of at least one member, rather than to limit the number thereof.
- Such words as “include” or “including” intends to indicate that an element or object before the word contains an element or object or equivalents thereof listed after the word, without excluding any other element or object.
- Such words as “connect/connected to” or “couple/coupled to” may include electrical connection, direct or indirect, rather than to be limited to physical or mechanical connection.
- Such words as “on”, “under”, “left” and “right” are merely used to represent relative position relationship, and when an absolute position of the object is changed, the relative position relationship will be changed too.
- the optical film 1 is provided with a certain amount of lug structures 2 , chutes 4 are formed in a side wall of a middle frame 3 , and the lug structures 2 of the optical film 1 are inserted into the chutes 4 respectively so as to be hung on the side wall of the middle frame 3 .
- a main problem in the related art lies in that the chute 4 formed in the middle frame 3 is opened upwardly and obliquely relative to the optical film 1 , and there is a gap between the lug structure 2 of the optical film 1 and the chute 4 (as shown by a dotted box B in FIG.
- the lug structure 2 of the optical film 1 and the chute 4 in the side wall of the middle frame 3 are each arranged very proximate to a display region A/A of the screen 5 , and a shadow of the lug structure is capable of being viewed in an image at a certain viewing angle. Hence, a visual effect and the user experience, and thereby display quality of the product, are adversely affected.
- X represents a minimum distance between an inner side wall of the middle frame 3 at a position corresponding to the chute and the display region A/A of the screen 5
- Y represents a distance between a light-exiting surface of the optical film 1 and a lower polarizer of the screen 5
- D represents a region where the shadow of the lug structure of the optical film 1 is visible
- H represents a viewing distance in a direction Z of the screen for determining the shadow of the lug structure of the optical film
- S 1 represents a distance between the inner side wall of the middle frame 3 at the position corresponding to the chute and a bending point of the optical film
- S 2 represents a thickness of the screen 5
- S 3 represents a distance between the bending point of the optical film and an upper edge of an opening of the chute in the middle frame.
- An object of the present disclosure is to provide a backlight module and a display device, so as to prevent the occurrence of the shadow of the lug structure of the optical film and improve image quality of a display product.
- the present disclosure provides in some embodiments a backlight module, which includes an optical film 100 , a light guide plate 500 and a middle frame 200 .
- the optical film 100 includes a light-exiting surface 100 a and a light-entering surface 100 b parallel to each other.
- the optical film 100 includes a body portion and a peripheral portion, and the body portion includes an optical film portion corresponding to a display region A/A of a display panel 400 .
- an orthogonal projection of the body portion onto the light-entering surface 100 b overlaps an orthogonal projection of the display region A/A onto the light-entering surface 100 b .
- the peripheral portion is arranged in such a manner as to surround the body portion, and the peripheral portion includes a plurality of lug structures 110 .
- the middle frame 200 surrounds the optical film 100 and is arranged proximate to the optical film 100 .
- the middle frame 200 at least includes a first portion 210 surrounding the optical film 100 and a second portion 220 arranged at a side where the light-entering surface 100 b of the optical film 100 is located.
- the light guide plate 500 is arranged at a side where the light-entering surface of the optical film 100 is located, and supported on the second portion 220 .
- the first portion 210 is arranged outside the light guide plate 500 , and the first portion 210 includes an inner surface 210 a facing an interior of the backlight module and an outer surface 210 b opposite to the inner surface 210 a .
- the inner surface 210 a faces the light guide plate 500
- the outer surface 210 b is distal to the light guide plate 500 .
- a plurality of transverse grooves 230 is formed in the first portion 210 at positions corresponding to the lug structures 110 and penetrates through the inner surface 210 a and the outer surface 210 b along a first direction F 1 , and the first direction F 1 is parallel to the light-exiting surface 100 a of the optical film 100 .
- Protrusion structures 240 are formed on the outer surface 210 b of the first portion 210 . Each lug structure 110 passes through the corresponding transverse groove 230 , and is bent and then sleeved on the protrusion structure 240 .
- the transverse grooves 230 are formed in the middle frame 200 of the backlight module in a direction parallel to the light-exiting surface 100 a of the optical film 100 , i.e., in a transverse direction.
- the protrusion structures 240 are formed on the outer surface of the middle frame 200 .
- the lug structure 110 of the optical film 100 may directly extend out of the transverse groove 230 , and it is then bent to cooperate with the corresponding protrusion structure 240 on the outer surface of the middle frame 200 for fixation.
- the chute is formed in the side wall of the middle frame at a certain angle relative to the light-exiting surface of the optical film, i.e., the chute is opened upwardly and obliquely relative to the optical film, so a part of light exits the middle frame upwardly and obliquely at a position where an opening of the chute is located.
- the transverse groove 230 in the middle frame 200 is formed in the transverse direction, and the lug structure 110 of the optical film 100 is directly inserted into the transverse groove 230 .
- an opening of the transverse groove 230 is covered by the optical film 100 , and less light exits the middle frame 200 at the opening of the transverse groove 230 .
- no shadow of the lug structure 110 occurs at this region at a large viewing angle, so it is able to improve the image quality of the display product.
- L represents a distance in a width direction of a screen for determining the shadow of the lug structure 110 of the optical film 100
- X represents a minimum distance between the inner surface 210 a of the middle frame 200 at a position corresponding to the transverse groove 230 and the display region A/A of the display panel
- Y represents a distance between the light-exiting surface 100 a of the optical film 100 and a lower polarizer of the display panel 400
- D represents a region where a shadow M of the lug structure 110 of the optical film 100 is visible
- H represents a viewing distance in a direction Z of a screen for determining the shadow of the lug structure 110 of the optical film 100
- S 2 represents a thickness of the display panel 400 .
- D is in direct proportion to the distance L in a direction perpendicular to the screen for determining the shadow and the distance Y between the light-exiting surface 100 a of the optical film 100 and the lower polarizer of the display panel 400 , and in reverse proportion to the distance X between the inner surface 210 a of the middle frame 200 at the position corresponding to the transverse groove 230 and the display region A/A of the display panel 400 as well as the viewing distance H in the direction Z of the screen for determining the shadow of the lug structure 110 of the optical film 100 .
- the region D where the shadow M of the lug structure 110 of the optical film 100 is visible needs to be smaller than or equal to 0.
- D ⁇ 0, H ⁇ YL/X ⁇ 1.74 i.e., when H ⁇ YL/X ⁇ 1.74 has been meet in accordance with a reference for determining image quality and the design parameters, it is able to make the shadow of the lug structure 110 invisible.
- the shadow of the lug structure 110 is invisible only when the above condition has been met.
- the design parameters X and Y are adjusted appropriately.
- the first portion 210 further includes a support surface 211 for supporting the display panel 400 .
- the support surface 211 is parallel to the light-exiting surface 100 a of the optical film 100 , and located between the inner surface 210 a and the outer surface 210 b .
- the transverse groove 230 is a concave structure formed in the support surface 211 .
- a concave part is formed in the support surface 211 of the middle frame 200 for supporting the display panel 400 , so as to form the transverse groove 230 .
- the lug structure 110 of the optical film 100 is directly lapped onto the transverse groove 230 in the middle frame 200 , and then the lug structure 110 is bent vertically to be hung on the protrusion structure 240 on the outer surface 210 of the middle frame 200 , so as to fix the optical film 100 in a convenient manner.
- the region D where the shadow is visible is in direct proportion to the distance Y between the light-exiting surface 100 a of the optical film 100 and the lower polarizer of the display panel 400 , so the smaller the value of Y, the smaller the region D.
- a second height difference between the support surface 211 and the light-exiting surface 100 a of the optical film 100 in a second direction F 2 is as small as possible, so as to meet the requirement on the parameter Y, thereby to enable the shadow of the lug structure 110 to be invisible.
- the transverse groove 230 is a through-groove structure rather than a concave structure, i.e., the support surface 211 is a complete surface, which will not be particularly further defined herein.
- a groove depth of the transverse groove 230 in the second direction perpendicular to the light-exiting surface 100 a of the optical film 100 is greater than a thickness of the optical film 100 by 0.2 mm to 0.5 mm.
- the thickness of the optical film 100 is about 0.6 mm to 0.9 mm, and the groove depth of the transverse groove is within a range of 0.8 mm to 1.4 mm.
- the transverse groove 230 includes a wall 231 for supporting the lug structure 110 .
- the wall 231 is parallel to the light-entering surface 100 b of the optical film 100 , and a first height difference H 1 is provided between the wall 231 and the light-entering surface 100 b of the optical film 100 in the second direction F 2 perpendicular to the light-exiting surface 100 a.
- the first height difference H 1 is within a range of 0.1 mm to 0.2 mm.
- the optical film 100 has a thickness of 0.6 mm to 0.9 mm, and when the first height difference H 1 is within the range of 0.1 mm to 0.2 mm, it is able to ensure that the transverse portion of the lug structure 110 is flush with the optical film 100 with a certain gap, thereby to prevent the lug structure 110 from being damaged due to thermal expansion and contraction and improve a service life of the product.
- the first height difference H 1 is 0.1 mm.
- the value of the first height difference H 1 is not limited to that mentioned hereinabove, and it is adjusted according to the practical need.
- a second height difference H 2 is provided between the light-exiting surface 100 a of the optical film 100 and the support surface 211 in the second direction F 2 perpendicular to the light-exiting surface 100 a.
- the support surface 211 of the middle frame 200 is used for supporting the display panel 400 , when the support surface 211 is located at a level higher than the light-exiting surface 100 a of the optical film 100 by the second height difference H 2 , it is able for the support surface 211 of the middle frame 200 to support the display panel 400 .
- the region D where the shadow is visible is in direct proportion to the distance Y between the light-exiting surface 100 a of the optical film 100 and the lower polarizer of the display panel 400 , so the smaller the value of Y, the smaller the region D.
- the second height difference H 2 between the support surface 211 and the light-exiting surface 100 a of the optical film 100 has been determined, the value of Y between the lower polarizer of the display panel 400 and the light-exiting surface 100 a of the optical film 100 is determined too, i.e., the second height difference H 2 is just the value of Y.
- the second height difference H 2 is within a range of 0.2 mm to 0.5 mm. Based on the above, the second height difference H 2 between the support surface 211 and the light-exiting surface 100 a of the optical film 100 in the second direction F 2 is as small as possible, so as to meet the requirement on the parameter Y, thereby to enable the shadow of the lug structure 110 to be invisible.
- the value of the second height difference H 2 is not limited to that mentioned hereinabove.
- a region where the body portion of the optical film 100 is located is a first region corresponding to the display region A/A of the display panel 400 .
- An orthogonal projection of the inner surface 210 a of the first portion 210 onto the light-entering surface 100 b of the optical film 100 is located out of the first region.
- the region D where the shadow is visible is reverse proportion to the distance X between the inner surface 210 a of the middle frame 200 at a position where the transverse groove 230 is formed and the display region A/A of the display panel 400 , so when the transverse groove 230 is formed in the first portion 210 of the middle frame 200 , the orthogonal projection of the inner surface 210 a of the first portion 210 onto the light-entering surface 100 b of the optical film 100 is located outside the first region.
- the larger the distance between the inner surface of the middle frame 200 at the position where the transverse groove is formed and the display region A/A of the display panel 400 the smaller the region D where the shadow is visible.
- a bezel width needs to be very small.
- the minimum distance X between the orthogonal projection of the inner surface 210 a of the first portion 210 onto the light-entering surface 100 b of the optical film 100 and the first region in the first direction F 1 is within a range of 0.1 mm to 0.2 mm.
- the numerical range of X is not limited thereto.
- the backlight module is not applied to the spliced screen or applied to different spliced products, different requirements need to be met, so the value of X needs to change accordingly, which will not be further particularly defined herein.
- the backlight module further includes a front frame 300 arranged at periphery of the middle frame 200 , and including an inner side wall 300 a facing the middle frame 200 and an outer side wall 300 b distal to the middle frame 200 .
- a recess 310 is formed in the inner side wall 300 a at a position corresponding to the lug structure 110 . After the lug structure 110 passes through the transverse groove 230 and is bent, a longitudinal portion 110 b of the lug structure 110 is accommodated in the recess 310 .
- the recess 310 is formed in the front frame 300 at the position corresponding to the lug structure 110 , so that the lug structure 110 is inserted into the recess 310 in the front frame 300 after being bent. In this way, it is able to further reduce the bezel width, and provide a distance between the inner surface 210 a of the middle frame 200 at a position where the transverse groove 230 is formed and the display region A/A of the display panel 400 as large as possible, thereby to further prevent the occurrence of the shadow of the lug structure 110 .
- the recess 310 is a notch penetrating through the inner side wall 300 a and the outer side wall 300 b of the front frame 300 .
- the notch is directly formed in the front frame 300 in such a manner as to penetrate through the front frame 300 .
- the lug structure 110 has a thickness of about 0.2 mm and the front frame 300 has a thickness of about 0.3 mm.
- the lug structure 110 is approximately located at a same plane as the outer side wall of the front frame 300 .
- it is able to provide a distance between the inner surface 210 a of the middle frame 200 at the position where the transverse groove 230 is formed and the display region A/A of the display panel 400 as large as possible.
- the recess is formed in the inner side wall of the front frame 300 but does not penetrate through the front frame 300 , which will not be particularly further defined herein.
- the lug structure 110 includes the transverse portion 110 a and the longitudinal portion 110 b after being bent.
- the longitudinal portion 110 b is fixed onto the outer surface 210 b of the middle frame 200 through an adhesive tape.
- the longitudinal portion 110 b includes a hole penetrating through the optical film 100 , and the lug structure 110 is sleeved on the protrusion structure 240 through the hole.
- a bending point of the lug structure 110 (i.e., a joint between the transverse portion 110 a and the longitudinal portion 110 b ) is located out of the outer surface 210 b of the middle frame 200 , and separated from the outer surface 210 b of the middle frame 200 in the first direction F 1 by a first distance d 1 .
- the bending point of the lug structure 110 is spaced apart from the outer surface 210 b of the middle frame 200 by the first distance.
- the lug structure 110 shall extend to be beyond the outer surface 210 b of the middle frame 200 and then the lug structure 110 is bent.
- it is able to meet a requirement on a tolerance when the lug structure 110 is bent, thereby to bend the lug structure 110 vertically and fix it to the outer surface 210 b of the middle frame 200 .
- due to the first distance d 2 it is able to prevent the lug structure 110 and the middle frame 200 from being damaged by the thermal expansion and contraction.
- the first distance d 1 is within a range of 0.1 mm to 0.2 mm.
- the first distance d 1 is 0.1 mm. It should be appreciated that, the above range is for illustrative purposes only, and the first distance d 1 is not limited thereto.
- the front frame 300 includes a front frame portion 320 for shielding a periphery of a display surface of the display panel 400 and a side frame portion 330 surrounding the display panel 400 , and a light-shielding adhesive 700 is attached onto the front frame portion 320 , so as to provide a narrow bezel.
- the front frame 300 merely includes the side frame portion rather than the front frame portion, so as to achieve a bezel-free design.
- the backlight module in the embodiments of the present disclosure is applicable to various display modules, especially a narrow-bezel display module, e.g., a display module with a spliced screen.
- the present disclosure further provides in some embodiments a display device, which includes the above-mentioned backlight module, and a display panel 400 arranged at a side where the light-exiting surface 100 a of the optical film 100 is located.
- the display panel 400 includes a liquid crystal panel.
- the display device further includes an upper polarizer 800 and a lower polarizer 900 .
- the upper polarizer 800 is attached onto a display surface of the display panel 400
- the lower polarizer 900 is attached onto a back surface of the display panel 400 .
- the display device in the embodiments of the present disclosure also has the beneficial effects of the backlight module, which will thus not be particularly defined herein.
Abstract
Description
-
- an optical film, wherein the optical film includes a body portion and a peripheral portion surrounding the body portion, and the peripheral portion includes a lug structure;
- a middle frame, wherein the middle frame is arranged at a side where a light-entering surface of the optical film is located, and at least includes a first portion and a second portion, the first portion is arranged proximate to the peripheral portion of the optical film, the second portion is arranged at a side of the first portion distal to the optical film, the first portion includes an inner surface facing an interior of the backlight module and an outer surface opposite to the inner surface,
- wherein a groove is formed in the first portion and extends from the inner surface to the outer surface, the lug structure at least includes a third portion and a fourth portion, the third portion is accommodated in the groove, a protrusion structure is formed on the outer surface, and the fourth portion extends along the outer surface and is sleeved on the protrusion structure.
Claims (17)
Applications Claiming Priority (3)
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CN202020200212.5 | 2020-02-24 | ||
CN202020200212.5U CN211087786U (en) | 2020-02-24 | 2020-02-24 | Backlight module and display device |
PCT/CN2021/073276 WO2021169693A1 (en) | 2020-02-24 | 2021-01-22 | Backlight module and display device |
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US20220317364A1 US20220317364A1 (en) | 2022-10-06 |
US11860403B2 true US11860403B2 (en) | 2024-01-02 |
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US17/425,711 Active 2041-09-08 US11860403B2 (en) | 2020-02-24 | 2021-01-22 | Backlight module including optical film with peripheral portion lug structure and display device including the same |
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US (1) | US11860403B2 (en) |
CN (1) | CN211087786U (en) |
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CN211087786U (en) * | 2020-02-24 | 2020-07-24 | 北京京东方显示技术有限公司 | Backlight module and display device |
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CN211087786U (en) | 2020-07-24 |
US20220317364A1 (en) | 2022-10-06 |
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